Yasushi TAUCHI / Mbed 2 deprecated giken9_HTMLServer_Sample

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Dependencies:   EthernetInterface HttpServer TextLCD mbed-rpc mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/ipv4/igmp.c@0:7766f6712673, 2014-03-12 (annotated)

Committer:
yueee_yt
Date:
Wed Mar 12 04:19:54 2014 +0000
Revision:
0:7766f6712673
???????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yueee_yt 0:7766f6712673 1 /**
yueee_yt 0:7766f6712673 2 * @file
yueee_yt 0:7766f6712673 3 * IGMP - Internet Group Management Protocol
yueee_yt 0:7766f6712673 4 *
yueee_yt 0:7766f6712673 5 */
yueee_yt 0:7766f6712673 6
yueee_yt 0:7766f6712673 7 /*
yueee_yt 0:7766f6712673 8 * Copyright (c) 2002 CITEL Technologies Ltd.
yueee_yt 0:7766f6712673 9 * All rights reserved.
yueee_yt 0:7766f6712673 10 *
yueee_yt 0:7766f6712673 11 * Redistribution and use in source and binary forms, with or without
yueee_yt 0:7766f6712673 12 * modification, are permitted provided that the following conditions
yueee_yt 0:7766f6712673 13 * are met:
yueee_yt 0:7766f6712673 14 * 1. Redistributions of source code must retain the above copyright
yueee_yt 0:7766f6712673 15 * notice, this list of conditions and the following disclaimer.
yueee_yt 0:7766f6712673 16 * 2. Redistributions in binary form must reproduce the above copyright
yueee_yt 0:7766f6712673 17 * notice, this list of conditions and the following disclaimer in the
yueee_yt 0:7766f6712673 18 * documentation and/or other materials provided with the distribution.
yueee_yt 0:7766f6712673 19 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
yueee_yt 0:7766f6712673 20 * may be used to endorse or promote products derived from this software
yueee_yt 0:7766f6712673 21 * without specific prior written permission.
yueee_yt 0:7766f6712673 22 *
yueee_yt 0:7766f6712673 23 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
yueee_yt 0:7766f6712673 24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
yueee_yt 0:7766f6712673 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
yueee_yt 0:7766f6712673 26 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
yueee_yt 0:7766f6712673 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
yueee_yt 0:7766f6712673 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
yueee_yt 0:7766f6712673 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
yueee_yt 0:7766f6712673 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
yueee_yt 0:7766f6712673 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
yueee_yt 0:7766f6712673 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
yueee_yt 0:7766f6712673 33 * SUCH DAMAGE.
yueee_yt 0:7766f6712673 34 *
yueee_yt 0:7766f6712673 35 * This file is a contribution to the lwIP TCP/IP stack.
yueee_yt 0:7766f6712673 36 * The Swedish Institute of Computer Science and Adam Dunkels
yueee_yt 0:7766f6712673 37 * are specifically granted permission to redistribute this
yueee_yt 0:7766f6712673 38 * source code.
yueee_yt 0:7766f6712673 39 */
yueee_yt 0:7766f6712673 40
yueee_yt 0:7766f6712673 41 /*-------------------------------------------------------------
yueee_yt 0:7766f6712673 42 Note 1)
yueee_yt 0:7766f6712673 43 Although the rfc requires V1 AND V2 capability
yueee_yt 0:7766f6712673 44 we will only support v2 since now V1 is very old (August 1989)
yueee_yt 0:7766f6712673 45 V1 can be added if required
yueee_yt 0:7766f6712673 46
yueee_yt 0:7766f6712673 47 a debug print and statistic have been implemented to
yueee_yt 0:7766f6712673 48 show this up.
yueee_yt 0:7766f6712673 49 -------------------------------------------------------------
yueee_yt 0:7766f6712673 50 -------------------------------------------------------------
yueee_yt 0:7766f6712673 51 Note 2)
yueee_yt 0:7766f6712673 52 A query for a specific group address (as opposed to ALLHOSTS)
yueee_yt 0:7766f6712673 53 has now been implemented as I am unsure if it is required
yueee_yt 0:7766f6712673 54
yueee_yt 0:7766f6712673 55 a debug print and statistic have been implemented to
yueee_yt 0:7766f6712673 56 show this up.
yueee_yt 0:7766f6712673 57 -------------------------------------------------------------
yueee_yt 0:7766f6712673 58 -------------------------------------------------------------
yueee_yt 0:7766f6712673 59 Note 3)
yueee_yt 0:7766f6712673 60 The router alert rfc 2113 is implemented in outgoing packets
yueee_yt 0:7766f6712673 61 but not checked rigorously incoming
yueee_yt 0:7766f6712673 62 -------------------------------------------------------------
yueee_yt 0:7766f6712673 63 Steve Reynolds
yueee_yt 0:7766f6712673 64 ------------------------------------------------------------*/
yueee_yt 0:7766f6712673 65
yueee_yt 0:7766f6712673 66 /*-----------------------------------------------------------------------------
yueee_yt 0:7766f6712673 67 * RFC 988 - Host extensions for IP multicasting - V0
yueee_yt 0:7766f6712673 68 * RFC 1054 - Host extensions for IP multicasting -
yueee_yt 0:7766f6712673 69 * RFC 1112 - Host extensions for IP multicasting - V1
yueee_yt 0:7766f6712673 70 * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
yueee_yt 0:7766f6712673 71 * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
yueee_yt 0:7766f6712673 72 * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
yueee_yt 0:7766f6712673 73 * RFC 2113 - IP Router Alert Option -
yueee_yt 0:7766f6712673 74 *----------------------------------------------------------------------------*/
yueee_yt 0:7766f6712673 75
yueee_yt 0:7766f6712673 76 /*-----------------------------------------------------------------------------
yueee_yt 0:7766f6712673 77 * Includes
yueee_yt 0:7766f6712673 78 *----------------------------------------------------------------------------*/
yueee_yt 0:7766f6712673 79
yueee_yt 0:7766f6712673 80 #include "lwip/opt.h"
yueee_yt 0:7766f6712673 81
yueee_yt 0:7766f6712673 82 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
yueee_yt 0:7766f6712673 83
yueee_yt 0:7766f6712673 84 #include "lwip/igmp.h"
yueee_yt 0:7766f6712673 85 #include "lwip/debug.h"
yueee_yt 0:7766f6712673 86 #include "lwip/def.h"
yueee_yt 0:7766f6712673 87 #include "lwip/mem.h"
yueee_yt 0:7766f6712673 88 #include "lwip/ip.h"
yueee_yt 0:7766f6712673 89 #include "lwip/inet_chksum.h"
yueee_yt 0:7766f6712673 90 #include "lwip/netif.h"
yueee_yt 0:7766f6712673 91 #include "lwip/icmp.h"
yueee_yt 0:7766f6712673 92 #include "lwip/udp.h"
yueee_yt 0:7766f6712673 93 #include "lwip/tcp.h"
yueee_yt 0:7766f6712673 94 #include "lwip/stats.h"
yueee_yt 0:7766f6712673 95
yueee_yt 0:7766f6712673 96 #include "string.h"
yueee_yt 0:7766f6712673 97
yueee_yt 0:7766f6712673 98 /*
yueee_yt 0:7766f6712673 99 * IGMP constants
yueee_yt 0:7766f6712673 100 */
yueee_yt 0:7766f6712673 101 #define IGMP_TTL 1
yueee_yt 0:7766f6712673 102 #define IGMP_MINLEN 8
yueee_yt 0:7766f6712673 103 #define ROUTER_ALERT 0x9404U
yueee_yt 0:7766f6712673 104 #define ROUTER_ALERTLEN 4
yueee_yt 0:7766f6712673 105
yueee_yt 0:7766f6712673 106 /*
yueee_yt 0:7766f6712673 107 * IGMP message types, including version number.
yueee_yt 0:7766f6712673 108 */
yueee_yt 0:7766f6712673 109 #define IGMP_MEMB_QUERY 0x11 /* Membership query */
yueee_yt 0:7766f6712673 110 #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
yueee_yt 0:7766f6712673 111 #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
yueee_yt 0:7766f6712673 112 #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
yueee_yt 0:7766f6712673 113
yueee_yt 0:7766f6712673 114 /* Group membership states */
yueee_yt 0:7766f6712673 115 #define IGMP_GROUP_NON_MEMBER 0
yueee_yt 0:7766f6712673 116 #define IGMP_GROUP_DELAYING_MEMBER 1
yueee_yt 0:7766f6712673 117 #define IGMP_GROUP_IDLE_MEMBER 2
yueee_yt 0:7766f6712673 118
yueee_yt 0:7766f6712673 119 /**
yueee_yt 0:7766f6712673 120 * IGMP packet format.
yueee_yt 0:7766f6712673 121 */
yueee_yt 0:7766f6712673 122 #ifdef PACK_STRUCT_USE_INCLUDES
yueee_yt 0:7766f6712673 123 # include "arch/bpstruct.h"
yueee_yt 0:7766f6712673 124 #endif
yueee_yt 0:7766f6712673 125 PACK_STRUCT_BEGIN
yueee_yt 0:7766f6712673 126 struct igmp_msg {
yueee_yt 0:7766f6712673 127 PACK_STRUCT_FIELD(u8_t igmp_msgtype);
yueee_yt 0:7766f6712673 128 PACK_STRUCT_FIELD(u8_t igmp_maxresp);
yueee_yt 0:7766f6712673 129 PACK_STRUCT_FIELD(u16_t igmp_checksum);
yueee_yt 0:7766f6712673 130 PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
yueee_yt 0:7766f6712673 131 } PACK_STRUCT_STRUCT;
yueee_yt 0:7766f6712673 132 PACK_STRUCT_END
yueee_yt 0:7766f6712673 133 #ifdef PACK_STRUCT_USE_INCLUDES
yueee_yt 0:7766f6712673 134 # include "arch/epstruct.h"
yueee_yt 0:7766f6712673 135 #endif
yueee_yt 0:7766f6712673 136
yueee_yt 0:7766f6712673 137
yueee_yt 0:7766f6712673 138 static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
yueee_yt 0:7766f6712673 139 static err_t igmp_remove_group(struct igmp_group *group);
yueee_yt 0:7766f6712673 140 static void igmp_timeout( struct igmp_group *group);
yueee_yt 0:7766f6712673 141 static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
yueee_yt 0:7766f6712673 142 static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
yueee_yt 0:7766f6712673 143 static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
yueee_yt 0:7766f6712673 144 static void igmp_send(struct igmp_group *group, u8_t type);
yueee_yt 0:7766f6712673 145
yueee_yt 0:7766f6712673 146
yueee_yt 0:7766f6712673 147 static struct igmp_group* igmp_group_list;
yueee_yt 0:7766f6712673 148 static ip_addr_t allsystems;
yueee_yt 0:7766f6712673 149 static ip_addr_t allrouters;
yueee_yt 0:7766f6712673 150
yueee_yt 0:7766f6712673 151
yueee_yt 0:7766f6712673 152 /**
yueee_yt 0:7766f6712673 153 * Initialize the IGMP module
yueee_yt 0:7766f6712673 154 */
yueee_yt 0:7766f6712673 155 void
yueee_yt 0:7766f6712673 156 igmp_init(void)
yueee_yt 0:7766f6712673 157 {
yueee_yt 0:7766f6712673 158 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
yueee_yt 0:7766f6712673 159
yueee_yt 0:7766f6712673 160 IP4_ADDR(&allsystems, 224, 0, 0, 1);
yueee_yt 0:7766f6712673 161 IP4_ADDR(&allrouters, 224, 0, 0, 2);
yueee_yt 0:7766f6712673 162 }
yueee_yt 0:7766f6712673 163
yueee_yt 0:7766f6712673 164 #ifdef LWIP_DEBUG
yueee_yt 0:7766f6712673 165 /**
yueee_yt 0:7766f6712673 166 * Dump global IGMP groups list
yueee_yt 0:7766f6712673 167 */
yueee_yt 0:7766f6712673 168 void
yueee_yt 0:7766f6712673 169 igmp_dump_group_list()
yueee_yt 0:7766f6712673 170 {
yueee_yt 0:7766f6712673 171 struct igmp_group *group = igmp_group_list;
yueee_yt 0:7766f6712673 172
yueee_yt 0:7766f6712673 173 while (group != NULL) {
yueee_yt 0:7766f6712673 174 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
yueee_yt 0:7766f6712673 175 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
yueee_yt 0:7766f6712673 176 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
yueee_yt 0:7766f6712673 177 group = group->next;
yueee_yt 0:7766f6712673 178 }
yueee_yt 0:7766f6712673 179 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
yueee_yt 0:7766f6712673 180 }
yueee_yt 0:7766f6712673 181 #else
yueee_yt 0:7766f6712673 182 #define igmp_dump_group_list()
yueee_yt 0:7766f6712673 183 #endif /* LWIP_DEBUG */
yueee_yt 0:7766f6712673 184
yueee_yt 0:7766f6712673 185 /**
yueee_yt 0:7766f6712673 186 * Start IGMP processing on interface
yueee_yt 0:7766f6712673 187 *
yueee_yt 0:7766f6712673 188 * @param netif network interface on which start IGMP processing
yueee_yt 0:7766f6712673 189 */
yueee_yt 0:7766f6712673 190 err_t
yueee_yt 0:7766f6712673 191 igmp_start(struct netif *netif)
yueee_yt 0:7766f6712673 192 {
yueee_yt 0:7766f6712673 193 struct igmp_group* group;
yueee_yt 0:7766f6712673 194
yueee_yt 0:7766f6712673 195 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
yueee_yt 0:7766f6712673 196
yueee_yt 0:7766f6712673 197 group = igmp_lookup_group(netif, &allsystems);
yueee_yt 0:7766f6712673 198
yueee_yt 0:7766f6712673 199 if (group != NULL) {
yueee_yt 0:7766f6712673 200 group->group_state = IGMP_GROUP_IDLE_MEMBER;
yueee_yt 0:7766f6712673 201 group->use++;
yueee_yt 0:7766f6712673 202
yueee_yt 0:7766f6712673 203 /* Allow the igmp messages at the MAC level */
yueee_yt 0:7766f6712673 204 if (netif->igmp_mac_filter != NULL) {
yueee_yt 0:7766f6712673 205 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
yueee_yt 0:7766f6712673 206 ip_addr_debug_print(IGMP_DEBUG, &allsystems);
yueee_yt 0:7766f6712673 207 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
yueee_yt 0:7766f6712673 208 netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
yueee_yt 0:7766f6712673 209 }
yueee_yt 0:7766f6712673 210
yueee_yt 0:7766f6712673 211 return ERR_OK;
yueee_yt 0:7766f6712673 212 }
yueee_yt 0:7766f6712673 213
yueee_yt 0:7766f6712673 214 return ERR_MEM;
yueee_yt 0:7766f6712673 215 }
yueee_yt 0:7766f6712673 216
yueee_yt 0:7766f6712673 217 /**
yueee_yt 0:7766f6712673 218 * Stop IGMP processing on interface
yueee_yt 0:7766f6712673 219 *
yueee_yt 0:7766f6712673 220 * @param netif network interface on which stop IGMP processing
yueee_yt 0:7766f6712673 221 */
yueee_yt 0:7766f6712673 222 err_t
yueee_yt 0:7766f6712673 223 igmp_stop(struct netif *netif)
yueee_yt 0:7766f6712673 224 {
yueee_yt 0:7766f6712673 225 struct igmp_group *group = igmp_group_list;
yueee_yt 0:7766f6712673 226 struct igmp_group *prev = NULL;
yueee_yt 0:7766f6712673 227 struct igmp_group *next;
yueee_yt 0:7766f6712673 228
yueee_yt 0:7766f6712673 229 /* look for groups joined on this interface further down the list */
yueee_yt 0:7766f6712673 230 while (group != NULL) {
yueee_yt 0:7766f6712673 231 next = group->next;
yueee_yt 0:7766f6712673 232 /* is it a group joined on this interface? */
yueee_yt 0:7766f6712673 233 if (group->netif == netif) {
yueee_yt 0:7766f6712673 234 /* is it the first group of the list? */
yueee_yt 0:7766f6712673 235 if (group == igmp_group_list) {
yueee_yt 0:7766f6712673 236 igmp_group_list = next;
yueee_yt 0:7766f6712673 237 }
yueee_yt 0:7766f6712673 238 /* is there a "previous" group defined? */
yueee_yt 0:7766f6712673 239 if (prev != NULL) {
yueee_yt 0:7766f6712673 240 prev->next = next;
yueee_yt 0:7766f6712673 241 }
yueee_yt 0:7766f6712673 242 /* disable the group at the MAC level */
yueee_yt 0:7766f6712673 243 if (netif->igmp_mac_filter != NULL) {
yueee_yt 0:7766f6712673 244 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
yueee_yt 0:7766f6712673 245 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
yueee_yt 0:7766f6712673 246 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
yueee_yt 0:7766f6712673 247 netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
yueee_yt 0:7766f6712673 248 }
yueee_yt 0:7766f6712673 249 /* free group */
yueee_yt 0:7766f6712673 250 memp_free(MEMP_IGMP_GROUP, group);
yueee_yt 0:7766f6712673 251 } else {
yueee_yt 0:7766f6712673 252 /* change the "previous" */
yueee_yt 0:7766f6712673 253 prev = group;
yueee_yt 0:7766f6712673 254 }
yueee_yt 0:7766f6712673 255 /* move to "next" */
yueee_yt 0:7766f6712673 256 group = next;
yueee_yt 0:7766f6712673 257 }
yueee_yt 0:7766f6712673 258 return ERR_OK;
yueee_yt 0:7766f6712673 259 }
yueee_yt 0:7766f6712673 260
yueee_yt 0:7766f6712673 261 /**
yueee_yt 0:7766f6712673 262 * Report IGMP memberships for this interface
yueee_yt 0:7766f6712673 263 *
yueee_yt 0:7766f6712673 264 * @param netif network interface on which report IGMP memberships
yueee_yt 0:7766f6712673 265 */
yueee_yt 0:7766f6712673 266 void
yueee_yt 0:7766f6712673 267 igmp_report_groups(struct netif *netif)
yueee_yt 0:7766f6712673 268 {
yueee_yt 0:7766f6712673 269 struct igmp_group *group = igmp_group_list;
yueee_yt 0:7766f6712673 270
yueee_yt 0:7766f6712673 271 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
yueee_yt 0:7766f6712673 272
yueee_yt 0:7766f6712673 273 while (group != NULL) {
yueee_yt 0:7766f6712673 274 if (group->netif == netif) {
yueee_yt 0:7766f6712673 275 igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
yueee_yt 0:7766f6712673 276 }
yueee_yt 0:7766f6712673 277 group = group->next;
yueee_yt 0:7766f6712673 278 }
yueee_yt 0:7766f6712673 279 }
yueee_yt 0:7766f6712673 280
yueee_yt 0:7766f6712673 281 /**
yueee_yt 0:7766f6712673 282 * Search for a group in the global igmp_group_list
yueee_yt 0:7766f6712673 283 *
yueee_yt 0:7766f6712673 284 * @param ifp the network interface for which to look
yueee_yt 0:7766f6712673 285 * @param addr the group ip address to search for
yueee_yt 0:7766f6712673 286 * @return a struct igmp_group* if the group has been found,
yueee_yt 0:7766f6712673 287 * NULL if the group wasn't found.
yueee_yt 0:7766f6712673 288 */
yueee_yt 0:7766f6712673 289 struct igmp_group *
yueee_yt 0:7766f6712673 290 igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
yueee_yt 0:7766f6712673 291 {
yueee_yt 0:7766f6712673 292 struct igmp_group *group = igmp_group_list;
yueee_yt 0:7766f6712673 293
yueee_yt 0:7766f6712673 294 while (group != NULL) {
yueee_yt 0:7766f6712673 295 if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
yueee_yt 0:7766f6712673 296 return group;
yueee_yt 0:7766f6712673 297 }
yueee_yt 0:7766f6712673 298 group = group->next;
yueee_yt 0:7766f6712673 299 }
yueee_yt 0:7766f6712673 300
yueee_yt 0:7766f6712673 301 /* to be clearer, we return NULL here instead of
yueee_yt 0:7766f6712673 302 * 'group' (which is also NULL at this point).
yueee_yt 0:7766f6712673 303 */
yueee_yt 0:7766f6712673 304 return NULL;
yueee_yt 0:7766f6712673 305 }
yueee_yt 0:7766f6712673 306
yueee_yt 0:7766f6712673 307 /**
yueee_yt 0:7766f6712673 308 * Search for a specific igmp group and create a new one if not found-
yueee_yt 0:7766f6712673 309 *
yueee_yt 0:7766f6712673 310 * @param ifp the network interface for which to look
yueee_yt 0:7766f6712673 311 * @param addr the group ip address to search
yueee_yt 0:7766f6712673 312 * @return a struct igmp_group*,
yueee_yt 0:7766f6712673 313 * NULL on memory error.
yueee_yt 0:7766f6712673 314 */
yueee_yt 0:7766f6712673 315 struct igmp_group *
yueee_yt 0:7766f6712673 316 igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
yueee_yt 0:7766f6712673 317 {
yueee_yt 0:7766f6712673 318 struct igmp_group *group = igmp_group_list;
yueee_yt 0:7766f6712673 319
yueee_yt 0:7766f6712673 320 /* Search if the group already exists */
yueee_yt 0:7766f6712673 321 group = igmp_lookfor_group(ifp, addr);
yueee_yt 0:7766f6712673 322 if (group != NULL) {
yueee_yt 0:7766f6712673 323 /* Group already exists. */
yueee_yt 0:7766f6712673 324 return group;
yueee_yt 0:7766f6712673 325 }
yueee_yt 0:7766f6712673 326
yueee_yt 0:7766f6712673 327 /* Group doesn't exist yet, create a new one */
yueee_yt 0:7766f6712673 328 group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
yueee_yt 0:7766f6712673 329 if (group != NULL) {
yueee_yt 0:7766f6712673 330 group->netif = ifp;
yueee_yt 0:7766f6712673 331 ip_addr_set(&(group->group_address), addr);
yueee_yt 0:7766f6712673 332 group->timer = 0; /* Not running */
yueee_yt 0:7766f6712673 333 group->group_state = IGMP_GROUP_NON_MEMBER;
yueee_yt 0:7766f6712673 334 group->last_reporter_flag = 0;
yueee_yt 0:7766f6712673 335 group->use = 0;
yueee_yt 0:7766f6712673 336 group->next = igmp_group_list;
yueee_yt 0:7766f6712673 337
yueee_yt 0:7766f6712673 338 igmp_group_list = group;
yueee_yt 0:7766f6712673 339 }
yueee_yt 0:7766f6712673 340
yueee_yt 0:7766f6712673 341 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
yueee_yt 0:7766f6712673 342 ip_addr_debug_print(IGMP_DEBUG, addr);
yueee_yt 0:7766f6712673 343 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
yueee_yt 0:7766f6712673 344
yueee_yt 0:7766f6712673 345 return group;
yueee_yt 0:7766f6712673 346 }
yueee_yt 0:7766f6712673 347
yueee_yt 0:7766f6712673 348 /**
yueee_yt 0:7766f6712673 349 * Remove a group in the global igmp_group_list
yueee_yt 0:7766f6712673 350 *
yueee_yt 0:7766f6712673 351 * @param group the group to remove from the global igmp_group_list
yueee_yt 0:7766f6712673 352 * @return ERR_OK if group was removed from the list, an err_t otherwise
yueee_yt 0:7766f6712673 353 */
yueee_yt 0:7766f6712673 354 static err_t
yueee_yt 0:7766f6712673 355 igmp_remove_group(struct igmp_group *group)
yueee_yt 0:7766f6712673 356 {
yueee_yt 0:7766f6712673 357 err_t err = ERR_OK;
yueee_yt 0:7766f6712673 358
yueee_yt 0:7766f6712673 359 /* Is it the first group? */
yueee_yt 0:7766f6712673 360 if (igmp_group_list == group) {
yueee_yt 0:7766f6712673 361 igmp_group_list = group->next;
yueee_yt 0:7766f6712673 362 } else {
yueee_yt 0:7766f6712673 363 /* look for group further down the list */
yueee_yt 0:7766f6712673 364 struct igmp_group *tmpGroup;
yueee_yt 0:7766f6712673 365 for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
yueee_yt 0:7766f6712673 366 if (tmpGroup->next == group) {
yueee_yt 0:7766f6712673 367 tmpGroup->next = group->next;
yueee_yt 0:7766f6712673 368 break;
yueee_yt 0:7766f6712673 369 }
yueee_yt 0:7766f6712673 370 }
yueee_yt 0:7766f6712673 371 /* Group not found in the global igmp_group_list */
yueee_yt 0:7766f6712673 372 if (tmpGroup == NULL)
yueee_yt 0:7766f6712673 373 err = ERR_ARG;
yueee_yt 0:7766f6712673 374 }
yueee_yt 0:7766f6712673 375 /* free group */
yueee_yt 0:7766f6712673 376 memp_free(MEMP_IGMP_GROUP, group);
yueee_yt 0:7766f6712673 377
yueee_yt 0:7766f6712673 378 return err;
yueee_yt 0:7766f6712673 379 }
yueee_yt 0:7766f6712673 380
yueee_yt 0:7766f6712673 381 /**
yueee_yt 0:7766f6712673 382 * Called from ip_input() if a new IGMP packet is received.
yueee_yt 0:7766f6712673 383 *
yueee_yt 0:7766f6712673 384 * @param p received igmp packet, p->payload pointing to the ip header
yueee_yt 0:7766f6712673 385 * @param inp network interface on which the packet was received
yueee_yt 0:7766f6712673 386 * @param dest destination ip address of the igmp packet
yueee_yt 0:7766f6712673 387 */
yueee_yt 0:7766f6712673 388 void
yueee_yt 0:7766f6712673 389 igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
yueee_yt 0:7766f6712673 390 {
yueee_yt 0:7766f6712673 391 struct ip_hdr * iphdr;
yueee_yt 0:7766f6712673 392 struct igmp_msg* igmp;
yueee_yt 0:7766f6712673 393 struct igmp_group* group;
yueee_yt 0:7766f6712673 394 struct igmp_group* groupref;
yueee_yt 0:7766f6712673 395
yueee_yt 0:7766f6712673 396 IGMP_STATS_INC(igmp.recv);
yueee_yt 0:7766f6712673 397
yueee_yt 0:7766f6712673 398 /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
yueee_yt 0:7766f6712673 399 iphdr = (struct ip_hdr *)p->payload;
yueee_yt 0:7766f6712673 400 if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
yueee_yt 0:7766f6712673 401 pbuf_free(p);
yueee_yt 0:7766f6712673 402 IGMP_STATS_INC(igmp.lenerr);
yueee_yt 0:7766f6712673 403 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
yueee_yt 0:7766f6712673 404 return;
yueee_yt 0:7766f6712673 405 }
yueee_yt 0:7766f6712673 406
yueee_yt 0:7766f6712673 407 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
yueee_yt 0:7766f6712673 408 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
yueee_yt 0:7766f6712673 409 LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
yueee_yt 0:7766f6712673 410 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
yueee_yt 0:7766f6712673 411 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
yueee_yt 0:7766f6712673 412
yueee_yt 0:7766f6712673 413 /* Now calculate and check the checksum */
yueee_yt 0:7766f6712673 414 igmp = (struct igmp_msg *)p->payload;
yueee_yt 0:7766f6712673 415 if (inet_chksum(igmp, p->len)) {
yueee_yt 0:7766f6712673 416 pbuf_free(p);
yueee_yt 0:7766f6712673 417 IGMP_STATS_INC(igmp.chkerr);
yueee_yt 0:7766f6712673 418 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
yueee_yt 0:7766f6712673 419 return;
yueee_yt 0:7766f6712673 420 }
yueee_yt 0:7766f6712673 421
yueee_yt 0:7766f6712673 422 /* Packet is ok so find an existing group */
yueee_yt 0:7766f6712673 423 group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
yueee_yt 0:7766f6712673 424
yueee_yt 0:7766f6712673 425 /* If group can be found or create... */
yueee_yt 0:7766f6712673 426 if (!group) {
yueee_yt 0:7766f6712673 427 pbuf_free(p);
yueee_yt 0:7766f6712673 428 IGMP_STATS_INC(igmp.drop);
yueee_yt 0:7766f6712673 429 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
yueee_yt 0:7766f6712673 430 return;
yueee_yt 0:7766f6712673 431 }
yueee_yt 0:7766f6712673 432
yueee_yt 0:7766f6712673 433 /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
yueee_yt 0:7766f6712673 434 switch (igmp->igmp_msgtype) {
yueee_yt 0:7766f6712673 435 case IGMP_MEMB_QUERY: {
yueee_yt 0:7766f6712673 436 /* IGMP_MEMB_QUERY to the "all systems" address ? */
yueee_yt 0:7766f6712673 437 if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
yueee_yt 0:7766f6712673 438 /* THIS IS THE GENERAL QUERY */
yueee_yt 0:7766f6712673 439 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
yueee_yt 0:7766f6712673 440
yueee_yt 0:7766f6712673 441 if (igmp->igmp_maxresp == 0) {
yueee_yt 0:7766f6712673 442 IGMP_STATS_INC(igmp.rx_v1);
yueee_yt 0:7766f6712673 443 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
yueee_yt 0:7766f6712673 444 igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
yueee_yt 0:7766f6712673 445 } else {
yueee_yt 0:7766f6712673 446 IGMP_STATS_INC(igmp.rx_general);
yueee_yt 0:7766f6712673 447 }
yueee_yt 0:7766f6712673 448
yueee_yt 0:7766f6712673 449 groupref = igmp_group_list;
yueee_yt 0:7766f6712673 450 while (groupref) {
yueee_yt 0:7766f6712673 451 /* Do not send messages on the all systems group address! */
yueee_yt 0:7766f6712673 452 if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
yueee_yt 0:7766f6712673 453 igmp_delaying_member(groupref, igmp->igmp_maxresp);
yueee_yt 0:7766f6712673 454 }
yueee_yt 0:7766f6712673 455 groupref = groupref->next;
yueee_yt 0:7766f6712673 456 }
yueee_yt 0:7766f6712673 457 } else {
yueee_yt 0:7766f6712673 458 /* IGMP_MEMB_QUERY to a specific group ? */
yueee_yt 0:7766f6712673 459 if (!ip_addr_isany(&igmp->igmp_group_address)) {
yueee_yt 0:7766f6712673 460 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
yueee_yt 0:7766f6712673 461 ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
yueee_yt 0:7766f6712673 462 if (ip_addr_cmp(dest, &allsystems)) {
yueee_yt 0:7766f6712673 463 ip_addr_t groupaddr;
yueee_yt 0:7766f6712673 464 LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
yueee_yt 0:7766f6712673 465 /* we first need to re-look for the group since we used dest last time */
yueee_yt 0:7766f6712673 466 ip_addr_copy(groupaddr, igmp->igmp_group_address);
yueee_yt 0:7766f6712673 467 group = igmp_lookfor_group(inp, &groupaddr);
yueee_yt 0:7766f6712673 468 } else {
yueee_yt 0:7766f6712673 469 LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
yueee_yt 0:7766f6712673 470 }
yueee_yt 0:7766f6712673 471
yueee_yt 0:7766f6712673 472 if (group != NULL) {
yueee_yt 0:7766f6712673 473 IGMP_STATS_INC(igmp.rx_group);
yueee_yt 0:7766f6712673 474 igmp_delaying_member(group, igmp->igmp_maxresp);
yueee_yt 0:7766f6712673 475 } else {
yueee_yt 0:7766f6712673 476 IGMP_STATS_INC(igmp.drop);
yueee_yt 0:7766f6712673 477 }
yueee_yt 0:7766f6712673 478 } else {
yueee_yt 0:7766f6712673 479 IGMP_STATS_INC(igmp.proterr);
yueee_yt 0:7766f6712673 480 }
yueee_yt 0:7766f6712673 481 }
yueee_yt 0:7766f6712673 482 break;
yueee_yt 0:7766f6712673 483 }
yueee_yt 0:7766f6712673 484 case IGMP_V2_MEMB_REPORT: {
yueee_yt 0:7766f6712673 485 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
yueee_yt 0:7766f6712673 486 IGMP_STATS_INC(igmp.rx_report);
yueee_yt 0:7766f6712673 487 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
yueee_yt 0:7766f6712673 488 /* This is on a specific group we have already looked up */
yueee_yt 0:7766f6712673 489 group->timer = 0; /* stopped */
yueee_yt 0:7766f6712673 490 group->group_state = IGMP_GROUP_IDLE_MEMBER;
yueee_yt 0:7766f6712673 491 group->last_reporter_flag = 0;
yueee_yt 0:7766f6712673 492 }
yueee_yt 0:7766f6712673 493 break;
yueee_yt 0:7766f6712673 494 }
yueee_yt 0:7766f6712673 495 default: {
yueee_yt 0:7766f6712673 496 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
yueee_yt 0:7766f6712673 497 igmp->igmp_msgtype, group->group_state, &group, group->netif));
yueee_yt 0:7766f6712673 498 IGMP_STATS_INC(igmp.proterr);
yueee_yt 0:7766f6712673 499 break;
yueee_yt 0:7766f6712673 500 }
yueee_yt 0:7766f6712673 501 }
yueee_yt 0:7766f6712673 502
yueee_yt 0:7766f6712673 503 pbuf_free(p);
yueee_yt 0:7766f6712673 504 return;
yueee_yt 0:7766f6712673 505 }
yueee_yt 0:7766f6712673 506
yueee_yt 0:7766f6712673 507 /**
yueee_yt 0:7766f6712673 508 * Join a group on one network interface.
yueee_yt 0:7766f6712673 509 *
yueee_yt 0:7766f6712673 510 * @param ifaddr ip address of the network interface which should join a new group
yueee_yt 0:7766f6712673 511 * @param groupaddr the ip address of the group which to join
yueee_yt 0:7766f6712673 512 * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
yueee_yt 0:7766f6712673 513 */
yueee_yt 0:7766f6712673 514 err_t
yueee_yt 0:7766f6712673 515 igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
yueee_yt 0:7766f6712673 516 {
yueee_yt 0:7766f6712673 517 err_t err = ERR_VAL; /* no matching interface */
yueee_yt 0:7766f6712673 518 struct igmp_group *group;
yueee_yt 0:7766f6712673 519 struct netif *netif;
yueee_yt 0:7766f6712673 520
yueee_yt 0:7766f6712673 521 /* make sure it is multicast address */
yueee_yt 0:7766f6712673 522 LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
yueee_yt 0:7766f6712673 523 LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
yueee_yt 0:7766f6712673 524
yueee_yt 0:7766f6712673 525 /* loop through netif's */
yueee_yt 0:7766f6712673 526 netif = netif_list;
yueee_yt 0:7766f6712673 527 while (netif != NULL) {
yueee_yt 0:7766f6712673 528 /* Should we join this interface ? */
yueee_yt 0:7766f6712673 529 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
yueee_yt 0:7766f6712673 530 /* find group or create a new one if not found */
yueee_yt 0:7766f6712673 531 group = igmp_lookup_group(netif, groupaddr);
yueee_yt 0:7766f6712673 532
yueee_yt 0:7766f6712673 533 if (group != NULL) {
yueee_yt 0:7766f6712673 534 /* This should create a new group, check the state to make sure */
yueee_yt 0:7766f6712673 535 if (group->group_state != IGMP_GROUP_NON_MEMBER) {
yueee_yt 0:7766f6712673 536 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
yueee_yt 0:7766f6712673 537 } else {
yueee_yt 0:7766f6712673 538 /* OK - it was new group */
yueee_yt 0:7766f6712673 539 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
yueee_yt 0:7766f6712673 540 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
yueee_yt 0:7766f6712673 541 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
yueee_yt 0:7766f6712673 542
yueee_yt 0:7766f6712673 543 /* If first use of the group, allow the group at the MAC level */
yueee_yt 0:7766f6712673 544 if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
yueee_yt 0:7766f6712673 545 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
yueee_yt 0:7766f6712673 546 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
yueee_yt 0:7766f6712673 547 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
yueee_yt 0:7766f6712673 548 netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
yueee_yt 0:7766f6712673 549 }
yueee_yt 0:7766f6712673 550
yueee_yt 0:7766f6712673 551 IGMP_STATS_INC(igmp.tx_join);
yueee_yt 0:7766f6712673 552 igmp_send(group, IGMP_V2_MEMB_REPORT);
yueee_yt 0:7766f6712673 553
yueee_yt 0:7766f6712673 554 igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
yueee_yt 0:7766f6712673 555
yueee_yt 0:7766f6712673 556 /* Need to work out where this timer comes from */
yueee_yt 0:7766f6712673 557 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
yueee_yt 0:7766f6712673 558 }
yueee_yt 0:7766f6712673 559 /* Increment group use */
yueee_yt 0:7766f6712673 560 group->use++;
yueee_yt 0:7766f6712673 561 /* Join on this interface */
yueee_yt 0:7766f6712673 562 err = ERR_OK;
yueee_yt 0:7766f6712673 563 } else {
yueee_yt 0:7766f6712673 564 /* Return an error even if some network interfaces are joined */
yueee_yt 0:7766f6712673 565 /** @todo undo any other netif already joined */
yueee_yt 0:7766f6712673 566 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
yueee_yt 0:7766f6712673 567 return ERR_MEM;
yueee_yt 0:7766f6712673 568 }
yueee_yt 0:7766f6712673 569 }
yueee_yt 0:7766f6712673 570 /* proceed to next network interface */
yueee_yt 0:7766f6712673 571 netif = netif->next;
yueee_yt 0:7766f6712673 572 }
yueee_yt 0:7766f6712673 573
yueee_yt 0:7766f6712673 574 return err;
yueee_yt 0:7766f6712673 575 }
yueee_yt 0:7766f6712673 576
yueee_yt 0:7766f6712673 577 /**
yueee_yt 0:7766f6712673 578 * Leave a group on one network interface.
yueee_yt 0:7766f6712673 579 *
yueee_yt 0:7766f6712673 580 * @param ifaddr ip address of the network interface which should leave a group
yueee_yt 0:7766f6712673 581 * @param groupaddr the ip address of the group which to leave
yueee_yt 0:7766f6712673 582 * @return ERR_OK if group was left on the netif(s), an err_t otherwise
yueee_yt 0:7766f6712673 583 */
yueee_yt 0:7766f6712673 584 err_t
yueee_yt 0:7766f6712673 585 igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
yueee_yt 0:7766f6712673 586 {
yueee_yt 0:7766f6712673 587 err_t err = ERR_VAL; /* no matching interface */
yueee_yt 0:7766f6712673 588 struct igmp_group *group;
yueee_yt 0:7766f6712673 589 struct netif *netif;
yueee_yt 0:7766f6712673 590
yueee_yt 0:7766f6712673 591 /* make sure it is multicast address */
yueee_yt 0:7766f6712673 592 LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
yueee_yt 0:7766f6712673 593 LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
yueee_yt 0:7766f6712673 594
yueee_yt 0:7766f6712673 595 /* loop through netif's */
yueee_yt 0:7766f6712673 596 netif = netif_list;
yueee_yt 0:7766f6712673 597 while (netif != NULL) {
yueee_yt 0:7766f6712673 598 /* Should we leave this interface ? */
yueee_yt 0:7766f6712673 599 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
yueee_yt 0:7766f6712673 600 /* find group */
yueee_yt 0:7766f6712673 601 group = igmp_lookfor_group(netif, groupaddr);
yueee_yt 0:7766f6712673 602
yueee_yt 0:7766f6712673 603 if (group != NULL) {
yueee_yt 0:7766f6712673 604 /* Only send a leave if the flag is set according to the state diagram */
yueee_yt 0:7766f6712673 605 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
yueee_yt 0:7766f6712673 606 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
yueee_yt 0:7766f6712673 607 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
yueee_yt 0:7766f6712673 608
yueee_yt 0:7766f6712673 609 /* If there is no other use of the group */
yueee_yt 0:7766f6712673 610 if (group->use <= 1) {
yueee_yt 0:7766f6712673 611 /* If we are the last reporter for this group */
yueee_yt 0:7766f6712673 612 if (group->last_reporter_flag) {
yueee_yt 0:7766f6712673 613 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
yueee_yt 0:7766f6712673 614 IGMP_STATS_INC(igmp.tx_leave);
yueee_yt 0:7766f6712673 615 igmp_send(group, IGMP_LEAVE_GROUP);
yueee_yt 0:7766f6712673 616 }
yueee_yt 0:7766f6712673 617
yueee_yt 0:7766f6712673 618 /* Disable the group at the MAC level */
yueee_yt 0:7766f6712673 619 if (netif->igmp_mac_filter != NULL) {
yueee_yt 0:7766f6712673 620 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
yueee_yt 0:7766f6712673 621 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
yueee_yt 0:7766f6712673 622 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
yueee_yt 0:7766f6712673 623 netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
yueee_yt 0:7766f6712673 624 }
yueee_yt 0:7766f6712673 625
yueee_yt 0:7766f6712673 626 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
yueee_yt 0:7766f6712673 627 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
yueee_yt 0:7766f6712673 628 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
yueee_yt 0:7766f6712673 629
yueee_yt 0:7766f6712673 630 /* Free the group */
yueee_yt 0:7766f6712673 631 igmp_remove_group(group);
yueee_yt 0:7766f6712673 632 } else {
yueee_yt 0:7766f6712673 633 /* Decrement group use */
yueee_yt 0:7766f6712673 634 group->use--;
yueee_yt 0:7766f6712673 635 }
yueee_yt 0:7766f6712673 636 /* Leave on this interface */
yueee_yt 0:7766f6712673 637 err = ERR_OK;
yueee_yt 0:7766f6712673 638 } else {
yueee_yt 0:7766f6712673 639 /* It's not a fatal error on "leavegroup" */
yueee_yt 0:7766f6712673 640 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
yueee_yt 0:7766f6712673 641 }
yueee_yt 0:7766f6712673 642 }
yueee_yt 0:7766f6712673 643 /* proceed to next network interface */
yueee_yt 0:7766f6712673 644 netif = netif->next;
yueee_yt 0:7766f6712673 645 }
yueee_yt 0:7766f6712673 646
yueee_yt 0:7766f6712673 647 return err;
yueee_yt 0:7766f6712673 648 }
yueee_yt 0:7766f6712673 649
yueee_yt 0:7766f6712673 650 /**
yueee_yt 0:7766f6712673 651 * The igmp timer function (both for NO_SYS=1 and =0)
yueee_yt 0:7766f6712673 652 * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
yueee_yt 0:7766f6712673 653 */
yueee_yt 0:7766f6712673 654 void
yueee_yt 0:7766f6712673 655 igmp_tmr(void)
yueee_yt 0:7766f6712673 656 {
yueee_yt 0:7766f6712673 657 struct igmp_group *group = igmp_group_list;
yueee_yt 0:7766f6712673 658
yueee_yt 0:7766f6712673 659 while (group != NULL) {
yueee_yt 0:7766f6712673 660 if (group->timer > 0) {
yueee_yt 0:7766f6712673 661 group->timer--;
yueee_yt 0:7766f6712673 662 if (group->timer == 0) {
yueee_yt 0:7766f6712673 663 igmp_timeout(group);
yueee_yt 0:7766f6712673 664 }
yueee_yt 0:7766f6712673 665 }
yueee_yt 0:7766f6712673 666 group = group->next;
yueee_yt 0:7766f6712673 667 }
yueee_yt 0:7766f6712673 668 }
yueee_yt 0:7766f6712673 669
yueee_yt 0:7766f6712673 670 /**
yueee_yt 0:7766f6712673 671 * Called if a timeout for one group is reached.
yueee_yt 0:7766f6712673 672 * Sends a report for this group.
yueee_yt 0:7766f6712673 673 *
yueee_yt 0:7766f6712673 674 * @param group an igmp_group for which a timeout is reached
yueee_yt 0:7766f6712673 675 */
yueee_yt 0:7766f6712673 676 static void
yueee_yt 0:7766f6712673 677 igmp_timeout(struct igmp_group *group)
yueee_yt 0:7766f6712673 678 {
yueee_yt 0:7766f6712673 679 /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
yueee_yt 0:7766f6712673 680 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
yueee_yt 0:7766f6712673 681 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
yueee_yt 0:7766f6712673 682 ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
yueee_yt 0:7766f6712673 683 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
yueee_yt 0:7766f6712673 684
yueee_yt 0:7766f6712673 685 IGMP_STATS_INC(igmp.tx_report);
yueee_yt 0:7766f6712673 686 igmp_send(group, IGMP_V2_MEMB_REPORT);
yueee_yt 0:7766f6712673 687 }
yueee_yt 0:7766f6712673 688 }
yueee_yt 0:7766f6712673 689
yueee_yt 0:7766f6712673 690 /**
yueee_yt 0:7766f6712673 691 * Start a timer for an igmp group
yueee_yt 0:7766f6712673 692 *
yueee_yt 0:7766f6712673 693 * @param group the igmp_group for which to start a timer
yueee_yt 0:7766f6712673 694 * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
yueee_yt 0:7766f6712673 695 * every call to igmp_tmr())
yueee_yt 0:7766f6712673 696 */
yueee_yt 0:7766f6712673 697 static void
yueee_yt 0:7766f6712673 698 igmp_start_timer(struct igmp_group *group, u8_t max_time)
yueee_yt 0:7766f6712673 699 {
yueee_yt 0:7766f6712673 700 /* ensure the input value is > 0 */
yueee_yt 0:7766f6712673 701 if (max_time == 0) {
yueee_yt 0:7766f6712673 702 max_time = 1;
yueee_yt 0:7766f6712673 703 }
yueee_yt 0:7766f6712673 704 /* ensure the random value is > 0 */
yueee_yt 0:7766f6712673 705 group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
yueee_yt 0:7766f6712673 706 }
yueee_yt 0:7766f6712673 707
yueee_yt 0:7766f6712673 708 /**
yueee_yt 0:7766f6712673 709 * Delaying membership report for a group if necessary
yueee_yt 0:7766f6712673 710 *
yueee_yt 0:7766f6712673 711 * @param group the igmp_group for which "delaying" membership report
yueee_yt 0:7766f6712673 712 * @param maxresp query delay
yueee_yt 0:7766f6712673 713 */
yueee_yt 0:7766f6712673 714 static void
yueee_yt 0:7766f6712673 715 igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
yueee_yt 0:7766f6712673 716 {
yueee_yt 0:7766f6712673 717 if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
yueee_yt 0:7766f6712673 718 ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
yueee_yt 0:7766f6712673 719 ((group->timer == 0) || (maxresp < group->timer)))) {
yueee_yt 0:7766f6712673 720 igmp_start_timer(group, maxresp);
yueee_yt 0:7766f6712673 721 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
yueee_yt 0:7766f6712673 722 }
yueee_yt 0:7766f6712673 723 }
yueee_yt 0:7766f6712673 724
yueee_yt 0:7766f6712673 725
yueee_yt 0:7766f6712673 726 /**
yueee_yt 0:7766f6712673 727 * Sends an IP packet on a network interface. This function constructs the IP header
yueee_yt 0:7766f6712673 728 * and calculates the IP header checksum. If the source IP address is NULL,
yueee_yt 0:7766f6712673 729 * the IP address of the outgoing network interface is filled in as source address.
yueee_yt 0:7766f6712673 730 *
yueee_yt 0:7766f6712673 731 * @param p the packet to send (p->payload points to the data, e.g. next
yueee_yt 0:7766f6712673 732 protocol header; if dest == IP_HDRINCL, p already includes an IP
yueee_yt 0:7766f6712673 733 header and p->payload points to that IP header)
yueee_yt 0:7766f6712673 734 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
yueee_yt 0:7766f6712673 735 * IP address of the netif used to send is used as source address)
yueee_yt 0:7766f6712673 736 * @param dest the destination IP address to send the packet to
yueee_yt 0:7766f6712673 737 * @param ttl the TTL value to be set in the IP header
yueee_yt 0:7766f6712673 738 * @param proto the PROTOCOL to be set in the IP header
yueee_yt 0:7766f6712673 739 * @param netif the netif on which to send this packet
yueee_yt 0:7766f6712673 740 * @return ERR_OK if the packet was sent OK
yueee_yt 0:7766f6712673 741 * ERR_BUF if p doesn't have enough space for IP/LINK headers
yueee_yt 0:7766f6712673 742 * returns errors returned by netif->output
yueee_yt 0:7766f6712673 743 */
yueee_yt 0:7766f6712673 744 static err_t
yueee_yt 0:7766f6712673 745 igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
yueee_yt 0:7766f6712673 746 {
yueee_yt 0:7766f6712673 747 /* This is the "router alert" option */
yueee_yt 0:7766f6712673 748 u16_t ra[2];
yueee_yt 0:7766f6712673 749 ra[0] = PP_HTONS(ROUTER_ALERT);
yueee_yt 0:7766f6712673 750 ra[1] = 0x0000; /* Router shall examine packet */
yueee_yt 0:7766f6712673 751 IGMP_STATS_INC(igmp.xmit);
yueee_yt 0:7766f6712673 752 return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
yueee_yt 0:7766f6712673 753 }
yueee_yt 0:7766f6712673 754
yueee_yt 0:7766f6712673 755 /**
yueee_yt 0:7766f6712673 756 * Send an igmp packet to a specific group.
yueee_yt 0:7766f6712673 757 *
yueee_yt 0:7766f6712673 758 * @param group the group to which to send the packet
yueee_yt 0:7766f6712673 759 * @param type the type of igmp packet to send
yueee_yt 0:7766f6712673 760 */
yueee_yt 0:7766f6712673 761 static void
yueee_yt 0:7766f6712673 762 igmp_send(struct igmp_group *group, u8_t type)
yueee_yt 0:7766f6712673 763 {
yueee_yt 0:7766f6712673 764 struct pbuf* p = NULL;
yueee_yt 0:7766f6712673 765 struct igmp_msg* igmp = NULL;
yueee_yt 0:7766f6712673 766 ip_addr_t src = *IP_ADDR_ANY;
yueee_yt 0:7766f6712673 767 ip_addr_t* dest = NULL;
yueee_yt 0:7766f6712673 768
yueee_yt 0:7766f6712673 769 /* IP header + "router alert" option + IGMP header */
yueee_yt 0:7766f6712673 770 p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
yueee_yt 0:7766f6712673 771
yueee_yt 0:7766f6712673 772 if (p) {
yueee_yt 0:7766f6712673 773 igmp = (struct igmp_msg *)p->payload;
yueee_yt 0:7766f6712673 774 LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
yueee_yt 0:7766f6712673 775 (p->len >= sizeof(struct igmp_msg)));
yueee_yt 0:7766f6712673 776 ip_addr_copy(src, group->netif->ip_addr);
yueee_yt 0:7766f6712673 777
yueee_yt 0:7766f6712673 778 if (type == IGMP_V2_MEMB_REPORT) {
yueee_yt 0:7766f6712673 779 dest = &(group->group_address);
yueee_yt 0:7766f6712673 780 ip_addr_copy(igmp->igmp_group_address, group->group_address);
yueee_yt 0:7766f6712673 781 group->last_reporter_flag = 1; /* Remember we were the last to report */
yueee_yt 0:7766f6712673 782 } else {
yueee_yt 0:7766f6712673 783 if (type == IGMP_LEAVE_GROUP) {
yueee_yt 0:7766f6712673 784 dest = &allrouters;
yueee_yt 0:7766f6712673 785 ip_addr_copy(igmp->igmp_group_address, group->group_address);
yueee_yt 0:7766f6712673 786 }
yueee_yt 0:7766f6712673 787 }
yueee_yt 0:7766f6712673 788
yueee_yt 0:7766f6712673 789 if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
yueee_yt 0:7766f6712673 790 igmp->igmp_msgtype = type;
yueee_yt 0:7766f6712673 791 igmp->igmp_maxresp = 0;
yueee_yt 0:7766f6712673 792 igmp->igmp_checksum = 0;
yueee_yt 0:7766f6712673 793 igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
yueee_yt 0:7766f6712673 794
yueee_yt 0:7766f6712673 795 igmp_ip_output_if(p, &src, dest, group->netif);
yueee_yt 0:7766f6712673 796 }
yueee_yt 0:7766f6712673 797
yueee_yt 0:7766f6712673 798 pbuf_free(p);
yueee_yt 0:7766f6712673 799 } else {
yueee_yt 0:7766f6712673 800 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
yueee_yt 0:7766f6712673 801 IGMP_STATS_INC(igmp.memerr);
yueee_yt 0:7766f6712673 802 }
yueee_yt 0:7766f6712673 803 }
yueee_yt 0:7766f6712673 804
yueee_yt 0:7766f6712673 805 #endif /* LWIP_IGMP */